[FFmpeg-devel] Configure with --cpu=host and Clang

[yukari yakumo]

Hi everyone!
I'm Gentoo Linux user and currently I play with Clang as default compiler.
And currently I tried to build ffmpeg 2.8.6 with Clang 3.9.0 and `-march=native` in C(XX)FLAGS (ffmpeg-2.8.6.ebuild automatically convert this to `--cpu=host` configure flag).
But I get `--cpu=host not supported with compiler clang` error on configure phase. It's seems like output of clang test compilation different from GCC's output.
I make a little patch that you can find in attachment to fix this issue. This is very similar to GCC's check_native method.
Thanks!
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